Sound Deadening

Reduce Noise & Heat for a More Comfortable 4WD Touring Experience

Upgrade your 60 Series Landcruiser, or similar-sized 4x4 wagon with a comprehensive soundproofing and thermal insulation pack. Whether you’re tackling long highway drives or off-road adventures, this pack is designed to reduce road noise, block heat transfer, and improve cabin comfort.

Each pack provides maximum coverage using high-quality materials engineered for Australian conditions.

Choosing the Right Pack – A Simple Guide:

Picking the right pack comes down to two key factors:

1️⃣ Where do you want to cover?

• Floor pan only → Standard Pack 1 or Premium Pack 2
• Floor pan + doors → Premium Pack 3
• Full vehicle (floor pan, doors, and roof) → Premium Pack 4

2️⃣ What type of underlay do you prefer?

• Standard (Waterproof Underlay – peel & stick foam) → Pack 1
• Premium (Mass Noise Liner – superior sound-blocking blanket, removable if the vehicle is submerged) → Pack 2, 3, or 4

Optional Upgrade – Extra Sound Deadener for the Cargo Area

The ribbed cargo area design naturally helps to reduce vibration and noise, which is why sound deadener is not included as standard—keeping both costs and weight (approximately 7kg) down.

However, many customers prefer to fully insulate the cargo area floor for complete coverage and a uniform finish. If you choose this optional upgrade, you’ll further reduce vibration noise, creating an even quieter and more insulated ride.

* If selecting this option, apply Stage 1 Sound Deadener before installing the Mass Noise Liner (MNL) in the cargo area.

Standard Pack (Pack 1) – Covers Floor Pan, Inner Quarter Panels & Rear Wheel Arches

Total weight: Approx. 30kg

✔ 3 Boxes (5.4 sq/m) of Stage 1 Sound Deadener
   ▪ Applied to the floor pan, firewall, inner quarter panels, and rear wheel arches to reduce panel vibrations and road noise.

✔ 2 Boxes (3.6 sq/m) of Waterproof Carpet Underlay
   ▪ A 10mm thick closed-cell foam, peel & stick for easy installation.
   ▪ Installed on top of the Stage 1 Sound Deadener on the floor pan to provide insulation against heat, reduce noise, and replicate factory underlay.

✔ 1 Sheet (1.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed directly onto the cargo area sheet metal as a removable sound blanket to block low-frequency noise.

* If selecting the optional Cargo Area Sound Deadener, apply it before installing this layer.

✔ Install Kit – Application Roller, Utility Knife & Aluminium Foil Tape

 Best for: General noise & heat reduction with a waterproof underlay.

Premium Packs – Maximum Noise & Heat Control

Please note: We aim to dispatch your order next business day. However, as these packs are cut on-site, occasional delays may occur. In rare cases, dispatch may take up to 3-5 business days.

Premium Floor Pan Pack (Pack 2) – Covers Floor Pan, Inner Quarter Panels & Rear Wheel Arches

Total weight: Approx. 45kg

✔ 3 Boxes (5.4 sq/m) of Stage 1 Sound Deadener
   ▪ Applied to the floor pan, firewall, inner quarter panels, and rear wheel arches for maximum noise control.

✔ 3 Sheets (4.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed on the floor pan under the carpet from the front cabin to the rear cargo area, providing luxury vehicle-level sound blocking.
   ▪ Can be removed if the vehicle is flooded and placed back once dry.

✔ 1 Sheet (1.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed in the cargo area as a removable sound blanket to block road and exhaust noise.

* If selecting the optional Cargo Area Sound Deadener, apply it before installing this layer.

✔ Install Kit

 Best for: Heavy-duty soundproofing and thermal insulation on the floor and cargo area.

Premium Floor Pan & Doors Pack (Pack 3) – Covers Floor Pan, Inner Quarter Panels, Rear Wheel Arches & Doors

Total weight: Approx. 55kg

✔ 4 Boxes (7.2 sq/m) of Stage 1 Sound Deadener
   ▪ Applied to the floor pan, firewall, inner quarter panels, rear wheel arches, and inside the doors to reduce noise and vibration.

✔ 3 Sheets (4.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed on the floor pan under the carpet from the front cabin to the rear cargo area, improving soundproofing and insulation.
   ▪ Can be removed if the vehicle is flooded and placed back once dry.

✔ 1 Sheet (1.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed in the cargo area as a removable sound blanket to block road and exhaust noise.

*If selecting the optional Cargo Area Sound Deadener, apply it before installing this layer.

✔ Install Kit

 Best for: Extensive soundproofing, including door coverage for reduced road noise.

Full Kit (Pack 4)– Covers Floor Pan, Inner Quarter Panels, Rear Wheel Arches, Doors & Roof

Total weight: Approx. 60kg

✔ 5 Boxes (9.0 sq/m) of Stage 1 Sound Deadener
   ▪ Applied to the floor pan, firewall, inner quarter panels, rear wheel arches, inside the doors, and on the roof for complete vehicle soundproofing.

✔ 3 Sheets (4.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed on the floor pan under the carpet from the front cabin to the rear cargo area, blocking noise at the source.
   ▪ Can be removed if the vehicle is flooded and placed back once dry.

✔ 1 Sheet (1.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed in the cargo area as a removable sound blanket to eliminate exhaust and road noise.

* If selecting the optional Cargo Area Sound Deadener, apply it before installing this layer.

✔ 3 Sheets (3 sq/m) of Insul-Layer
   ▪ A peel & stick closed-cell foam applied to the roof skin to reduce heat buildup and stop drumming effects.

✔ Install Kit

 Best for: Complete 4WD insulation, covering floor, doors, and roof for the quietest ride possible.

Car Builders Stage 1 Sound Deadener is a vibration (sound) dampening mat. It consists of a butyl rubber noise absorption layer combined with an aluminium top layer.

Each box has 12 sheets, each sheet is 300x500mm and 2mm-2.2mm thick. 

Car Builders butyl based Sound Deadener does not require heating, does not smell and will not go brittle over time, which are all qualities of old style tar or bitumen sound deadening materials.

Car Builders Sound Deadener has pressure sensitive butyl rubber, which is inherently sticky eliminating the risk of an adhesive layer failing.

Features/Advantages

• Easy installation - just peel off the release liner and roll it on
• 100% waterproof - does not rot or deteriorate
• Cuts with scissors or a knife
• Reduces heat transfer
• Conforms and fuses easily to all types of sheet metal
• No odour
   

Applications

• Under carpets
• Roof skins
• Inside cavities
• 1/4 panels
• Doors
• Boots/trunks
• Firewalls
   

Colours (product is exactly the same - only the print on the aluminium changes)
Silver - Silver with black logo
Black - Black with silver logo
OEM Black - Plain black no logo

Appearance:
Black Butyl based core with silvery aluminium reinforced layer backed with white wax paper release liner.

Thickness:
2.0 - 2.2mm

Weight:
3.2kg/p sm

Acoustic Loss Factor:
(ASTM method E756 @ 200Hz, Temperature range -10°C to +60°C)
0.08 to 0.41

Recommended Install Temperature:
-10°C to +60°C

Resistance Temperature Range:
-40°C to +149°C

Chemical Resistance:
Resistant to water and mineral oils

Adhesive Peel Strength:
65N/cm on cold steel

Storage:
Product should be stored at room temperature for best application and should be stored horizontally in its package.

Sound Deadening FAQ

Our Door Restore Kit comes complete with OE plastic and adhesive sealant tape to water proof door cavities before interior trim is installed.

Without any waterproof barrier your timber door trims are exposed to water and moisture that passes through the inner door cavity. The nature of water will lead to distorting timber door cards and potentially mould in your door trims.

We have put together a premium heavy weight plastic film which comes over sized ready to stick down to any door shape.

Application:

1. Apply the black waterproof seal tape to the perimeter of the door, ensuring you leave door trim mounts exposed.
TIP* When you get to tight corner remove a portion of the tape backing to allow the tape to bend and make a neat radius.

2. Remove the film off the water proof tape

3. Stretch out the protective film and touch it down on the waterproof seal tape. Apply pressure where the film contacts to create a strong bond.

4. With a utility knife cut around the outside perimeter of the seal path to remove the excess film and create that original factory finish.

Two door - Door restore kit:

The Mass Noise Liner Joining Kit comes complete with our mass loaded vinyl in its raw form to match our Mass Noise Liner products. Together with our specific cyanoacrylate glue this kit allows you to patch any relief cuts, overlap and join your sound barrier layer to create a total seal.

Size:
3m x 75mm
2mm thick mass loaded vinyl

This will help make your sound barrier underlay a perfect tailored fit to avoid leaking any sound through gaps. You can even get creative and glue tabs with velcro for removable applications.

Vinyl Specs: 

Size:

• 3m x 75mm
• 2mm thick mass loaded vinyl

Glue Specs:

• Appearance: Clear Liquid
• Composition: Ethyl Cyanoacrylate
• Viscocity: Low
• Cure Speed: Fast
• Strength: High

Car Builders Mass Noise Liner is a 12mm thick, heavy weight, acoustic barrier. This product is used over the top of sound deadening (stage 1) which is applied directly onto the sheet metal. Sound deadening stops noise created by panel vibration whereas Mass Noise Liner (stage 2) reduces air borne noise generated from the engine, road etc. This premium carpet underlay is an OEM product used in high-end luxury vehicles. Mass Noise Liner replaces cotton jute or shoddy, creating far superior sound proofing results.

Construction
2mm Mass Loaded vinyl upper layer, coupled with an 10mm closed cell foam to create the most effective means of acoustic blocking. Our flexible closed cell foam is water resistant and offers superior thermal insulation.

Features/Advantages

• Heavy duty sound blocking
• Water resistant 
• Removable
• Cuts with scissor and knife
• Reduces heat transfer
• Does not rot or deteriorate

Applications

• Firewalls
• Cargo areas
• Van floors
• Boot floors

It is not 100% necessary to put Stage 1 Sound Deadener underneath Mass Noise Liner on cargo area floors or van floors due to the metal already being fairly rigid from the ribs. The Mass Noise Liner will be an effective floor sound proofing by itself. 

Ideal for:

• 4WD's and muscle cars - firewall barrier to reduce engine noise
• Trucks - reduce engine noise and heat on floors and firewalls, great for serviceability
• Exhaust drone - drop in as a boot liner to reduce exhaust drone particular common in 6's, V8's and flat fours.
• Engine rooms, compressors etc
  
  

Note: due to the weight of our Mass Noise Liner it is not recommended for use on the underside of horizontal surfaces. For these applications you should use our light weight foam such as Acoustic Liner, Water proof carpet underlay, Under bonnet insulation or our 6mm Insul-layer.

Ideal for: 4WD's - firewall barrier to reduce engine noise Trucks - reduce engine noise and heat on floors and firewalls, great for serviceability Exhaust drone - drop in as a boot liner to reduce exhaust drone particularly common in 6's, V8's and flat fours. Engine rooms, compressors etc

Car Builders Water Proof Carpet Underlay is a single layer, closed cell foam, meaning it does not hold water. It also works great as a thermal and acoustic insulation barrier.

It is suitable for 4x4's, convertibles and industrial vehicles, which get constantly exposed to wet environments.

Car Builders Water Proof Carpet Underlay will not stay damp, smell, rot or attract mould like pre-dated cotton mill scrap, traditionally used under carpets.

It comes with a peel and stick backing and is easy to cut and install. It is also effective as a thermal barrier to reduce heat transfer from the exterior of your vehicle.  The material will reduce radiant heat by up to 20°C, and can be the difference between discomfort and pleasure.

Features/Advantages

• Light Weight
• Easy installation - just peel off the release liner and adhere to surface.
• Cuts with scissor and knife
• Reduces heat transfer
• Does not rot or deteriorate

Applications

• Under carpets
• Roof skins
• Inside cavities
• 1/4 panels
• Doors
• Firewalls

Size

Each box comes with 1 sheet inside, each sheet is 1800mm x 950mm resulting in 1.71sq/m.

Waterproof Carpet Underlay FAQ

What thickness carpet underlay should I use?

Carpet underlay thicknesses range between 4-12mm. This range allows you to insulate effectively and fit it under tighter areas such as the transmission tunnel.

Specifications:

Thickness:
10mm

Weight:
0.55kg/sm

Sheet size:
1800 x 950mm 

Material:
Closed cell foam

Adhesive Resistance Temperature Range:
-40°C to +110°C (long term) +135°C (short term)

Flame retardant:
Yes, B2

Reduce Noise & Heat for a More Comfortable 4WD Touring Experience

Upgrade your 60 series landcruiser with a comprehensive soundproofing and thermal insulation pack. Whether you’re tackling long highway drives or off-road adventures, this pack is designed to reduce road noise, block heat transfer, and improve cabin comfort.

Each pack provides maximum coverage using high-quality materials engineered for Australian conditions.

Choosing the Right Pack – A Simple Guide

1️⃣ Where do you want to cover?

• Floor pan only → Pack 1
• Floor pan + doors → Pack 2
• Full vehicle (floor pan, doors, and roof) → Premium Pack 3

2️⃣ Optional Upgrade – Extra Sound Deadener for the Cargo Area

The ribbed cargo area design naturally helps to reduce vibration and noise, which is why sound deadener is not included as standard—keeping both costs and weight (approximately 7kg) down.

However, many customers prefer to fully insulate the cargo area floor for complete coverage and a uniform finish. If you choose this optional upgrade, you’ll further reduce vibration noise, creating an even quieter and more insulated ride.

• If selecting this option, apply Stage 1 Sound Deadener before installing the Mass Noise Liner (MNL) in the cargo area.

Premium Packs – Maximum Noise & Heat Control

Pre-cut floors dispatch within 3-5 business days

Premium Floor Pan Pack (Pack 1) – Covers Floor Pan, Inner Quarter Panels & Rear Wheel Arches

Total weight: Approx. 45kg

✔ 3 Boxes (5.4 sq/m) of Stage 1 Sound Deadener
   ▪ Applied to the floor pan, firewall, inner quarter panels, and rear wheel arches for maximum noise control.

✔ 4 Sheets (4.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed on the floor pan under the carpet from the front cabin to the rear cargo area, providing luxury vehicle-level sound blocking.
   ▪ Can be removed if the vehicle is flood and placed back once dry.

✔ 1 Sheet (1.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed in the cargo area as a removable sound blanket to block road and exhaust noise.

* If selecting the optional Cargo Area Sound Deadener, apply it before installing this layer.

✔ Install Kit

 Best for: Heavy-duty soundproofing and thermal insulation on the floor and cargo area.

Premium Floor Pan & Doors Pack (Pack 2) – Covers Floor Pan, Inner Quarter Panels, Rear Wheel Arches & Doors

Total weight: Approx. 55kg

✔ 4 Boxes (7.2 sq/m) of Stage 1 Sound Deadener
   ▪ Applied to the floor pan, firewall, inner quarter panels, rear wheel arches, and inside the doors to reduce noise and vibration.

✔ 4 Sheets (4.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed on the floor pan under the carpet from the front cabin to the rear cargo area, improving soundproofing and insulation.
   ▪ Can be removed if the vehicle is flooded and placed back once dry.

✔ 1 Sheet (1.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed in the cargo area as a removable sound blanket to block road and exhaust noise.

*If selecting the optional Cargo Area Sound Deadener, apply it before installing this layer.

✔ Install Kit

 Best for: Extensive soundproofing, including door coverage for reduced road noise.

Full Kit (Pack 3)– Covers Floor Pan, Inner Quarter Panels, Rear Wheel Arches, Doors & Roof

Total weight: Approx. 60kg

✔ 5 Boxes (9.0 sq/m) of Stage 1 Sound Deadener
   ▪ Applied to the floor pan, firewall, inner quarter panels, rear wheel arches, inside the doors, and on the roof for complete vehicle soundproofing.

✔ 4 Sheets (4.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed on the floor pan under the carpet from the front cabin to the rear cargo area, blocking noise at the source.
   ▪ Can be removed if the vehicle is flooded and placed back once dry.

✔ 1 Sheet (1.5 sq/m) of Mass Noise Liner (MNL)
   ▪ Installed in the cargo area as a removable sound blanket to eliminate exhaust and road noise.

* If selecting the optional Cargo Area Sound Deadener, apply it before installing this layer.

✔ 3 Sheets (3 sq/m) of Insul-Layer
   ▪ A peel & stick closed-cell foam applied to the roof skin to reduce heat buildup and stop drumming effects.

✔ Install Kit

 Best for: Complete 4WD insulation, covering floor, doors, and roof for the quietest ride possible.

Upgrade your 60 series landcruiser today for a quieter, cooler, and more comfortable drive. Not sure which pack is right for you? Our team is happy to walk you through the options and help you choose the best solution for you, email team@siegeoverland.com.

Car Builders Premium Spray Adhesive is suitable for all your upholstery projects, from roof linings to carpet. Our Spray Adhesive is manufactured right here in Australia and has been tested and proven at 120°C

Glues aren’t what they used to be....... you won't be disappointed with our contact adhesive.

Car Builders Premium Spray Adhesive is suitable for all your upholstery projects, from roof linings to carpet. Our Spray Adhesive is manufactured right here in Australia and has been tested and proven at 120°C. These highly charge cans feature an easy to use adjustable nozzle which spray out in a thick splatter type pattern. Not to be mistake for fine mist contact adhesive this is an Industrial grade glue that will cover large surfaces.

 Simply spray both surfaces allow a short amount of time to tack and bond 2 x materials together.

Great for:

• Additional strength when using self-adhesive products
• Installing finished carpet on floors, wheels arches, roofs and walls.
• Permanent bond on plastics. metal, wood, glass, fabric, flexible foam and paper

Coverage
7sq/m per can Note: both adhering surfaces must be coated therefore allow 3.5sq/m coverage per can.

Teperature range

Effective bonding range between - 16°C and 120°C

Clean up
Clean overspray with Mineral Turpentine or Eucalyptus

7sq/m coverage per can Note: both adhering surfaces must be coated therefore allow 3.5sq/m coverage per can.

Application should be between 16°C - 27°C.

Spray about 10-20 cm away at a 90 degree angle to the surface, applying a uniform, even coat of adhesive to obtain 80% to 100% coverage of the
surface. If necessary, spray another coat of adhesive in areas that appear to need more adhesive. Spray both surfaces to be bonded, one surface vertically and the other surface horizontally. Allow the adhesive to tack off until no adhesive transfers to the knuckle when touched. Adhere surfaces and press together with adequate pressure. A roller is recommended to apply a uniform pressure to achieve maximum strength. Allow 24 hours for the adhesive to fully cure.

Safety data sheet: https://www.carbuilders.com.au/assets/files/Car-Builders-Spray-Adhesive-Aerosol-MSDS.pdf

The essential kit when installing your peel and stick products.

The kit includes:

1 x Application roller - 50mm wide timber wheel with rounded edges, rolling on sealed bearings. Comfortable timber handle which doubles as a tapered end to work sound deadener sheets into corrugations on your floor pan.

1 x Utility Knife - Fold away with quick change double side blades. 5 x spare blades will surpass the install and make for a neat stock in your tool kit..

1 x Roll of Aluminium Foil Tape - 38mm wide x 10 meters long. Our premium tape is 0.05mm thick, making it strong and robust to cover all joints and neatly complete the job. This tape is sure to come in handy for any build, in various places on your vehicle.

Plushlay is the ‘easy to install’ solution when it comes to selecting under carpet insulation in your vehicle. Designed to replace and improve on traditional cotton or sisal variations, Plushlay utilises a balance of density and thickness to give you a premium under foot solution, which will fit and feel like your carpet did when it was new.

- Contours to complex shapes
- Minimal cutting required
- Will not breakdown or rot
- Odourless

You can use a Spray Adhesive to glue it in position, or simply place it into position, making it removable at a later date.

If you're chasing a factory finish and period correct look, Plushlay is the solution for you.

Thickness:                                           16mm ±2 (5/8”)

Weight:                                                1200gsm (±120gsm)

Burn rate:                                            95mm/min (FMVSS302)

Sheet Size:                                           1.8m x 950mm

Car Builders Insul-Layer is a peel and stick closed cell foam designed to fit in tight areas. It offers acoustic and thermal insulation, prevents condensation and is very affordable.  

Our Insul-Layer will not rot, attract mould and is easy to cut and apply.

NOTE: For all inverted or vertical applications that will be covered in carpet/fabric (IE having more weight added to the surface of the Insul-Layer), we recommend applying an upholstery grade Spray Adhesive rate at 120°C. 

Features/Advantages

• Light Weight
• Easy installation - just peel off the release liner and adhere to surface.
• Cuts with scissor and knife
• Reduces heat transfer
• Does not rot or deteriorate
• Affordable

Applications

• Roof skins 
• Inside cavities
• 1/4 panels
• Doors
• In-between trim panels to reduce vibrations/rattles (3mm Insul-Layer's main purpose)
• Vans & campers (6mm 6.5M Roll is perfect for these)

(6.5M Roll is plain black, no branding)

What are the rules for applying a peel & stick product?

It is vitally important when laying a peel & stick product that the surface is thoroughly cleaned to remove any grim or dirt. We use a wax and grease remover. If you use a product such as methylated spirits or turps, as these are oil based, they will leave a residue that can affect the bond. Use a isopropyl alcohol (wax and grease remover) to remove this film.

Peel & stick products adhere well to metal surfaces, however if you are sticking the product to porous or rough materials, such as factory bitumen sound deadener, the product will require additional Spray Adhesive. 

Peel & stick products should not be stretched when applied to a surface as the material will eventually want to 'pop' back.

You need to ensure that peel & stick products are thoroughly rolled down, with pressure applied across the entire product to ensure that it has firmly adhered to the surface. We use an Application Roller.

If you find an air bubble, you should pierce the bubble to release the trapped air and roll the product down firmly.

We recommend using additional spray adhesive when using products in inverted positions or if you are directly adding further weight onto the product, such as glueing 4-way stretch carpet to the product's surface.

Car Builders Acoustic Liner is a multi-layer open and closed cell foam with a peel and stick backing. It offers a high level of acoustic and thermal insulation superior to that of traditional jute underlay.

Car Builders premium underlay is today's answer to predated jute and cotton mill scrap traditionally used under carpets. Acoustic Liner will not rot, attract mold, is easy to cut and does not require the application of glue (unless it is being laid in an inverted position).

Features/Advantages

• Light Weight
• Easy installation - just peel off the release liner and adhere to surface.
• Cuts with scissor and knife
• Reduces heat transfer
• Does not rot or deteriorate

Applications

• Under carpets
• Inside cavities
• 1/4 panels
• Doors
• Firewalls

Each box comes with a single sheet inside, each sheet is 950mm x 1800mm resulting in 1.7sq/m per box. 

Acoustic Liner Carpet Underlay FAQ

What thickness carpet underlay should I use?

Carpet underlay thicknesses range between 4-12mm. This range allows you to insulate effectively and fit it under tighter areas such as the transmission tunnel.

​Material:
6mm open cell foam (lighter grey colour) and 6mm closed cell foam (darker foam on top).   

​Material temperature resistance:  

Adhesive temperature resistance: